ML19253A509
| ML19253A509 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 08/22/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 7909100179 | |
| Download: ML19253A509 (1) | |
Text
CEt4 TRAL FILES
'o UNITED STATES PDR:HQ hm (#,,o/b E 89 NUCLEAR REGULATORY COMMISSION REGION IV g
611 HYAN PLAZA DRIVE, SUITE 1000 o
August 22, 1979 Docket No.
50-298 Nebraska Public Power District ATTN:
J. M. Pilant, Director Licensing & Quality Assurance Post Office Box 499 Colt m, Nebraska 68601 Centlemen:
Enclosed is IE Bulletin No. 79-02, Revision 1, Supplement No. 1, which clarifies NRC posi'aions on actions requested with regard to your power teactor facility with na operating license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, 0
hCb c4N/P 7
Karl V. Seyfrit Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplenent No. 1) 2.
List of IE Bulletir.s Issued in Last Six Months cc:
L. C. Lessor, Superintendent Cooper Nuclear Station Post Office Box 98 Brownville. Nebraska 68321 S;3 bob 3 7 900100 / 77 p
UNITED STATES NUCLEAR REGULATORY COWilSSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-02 Revision No. 1 (Supplement No. 1)
Date: August 20, 1979 Page 1 of 2 PIPE SOFORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
The supplement to IE Bulletin No. 79-02 is intended to establish criteria for the evaluation of interim acceptability of plant operation with less than the design factors of safety for piping supports due to as-built problems, under design, base plate flexibility, or anchor bolt deficiencies.
In the reviews for system operability of the Duane Arnold and Crystal River facilities, criteria have been developed by the NRC staff that defines pipe support operability. The criteria has been applied in lieu of other analysis or evaluation.
Specifically, the licensees identified problems with pipe.
supports in which the original design factors of safety were not met but some lesser margin was available. The design margins of four or five are intended to be final design and installation objectives, but systems may be classed as oper.ble on an interim basis with some lesser margin, providing a program of restoration to at least the Bulletin factors of safety has been developed.
Facilities which fall outside the operability criteria are considered to probably require a Technical Specification exception and will require review on a case-by-case basis.
Action to be Taken by Licensees:
For the following two cases, p u x operation may continue or may begin:
a.
For the support as a unit, the factor of safety compared to ulti-mate strengths is less than the original design but equal to or greater than two.
b.
For the anchor bolts the factor of safety is equal to or greater than two and for the support steel the original design factor of safety com-pared to ultimate strengths is met.
The above criteria may be applied pro graded to design margins of safety ex QUPLICATE DOCUMENT and by the next refueling for nonacce n.p fined in Bulletin No. 79-14 where "no Entire d of the plant which can be entered dur into sys em underPreviously entered ANO_
Og/Q/4 N
of Pacles:_
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